By sheer luck, I stumbled on Alt-Enter to produce a dialog asking to accept or reject the license agreement.
Lamba Stack install completed and no more incompatibility reported:
rh@lambda-quad:~$ nvidia-smi
Sun Mar 3 09:23:03 2019
±----------------------------------------------------------------------------+
| NVIDIA-SMI 410.78 Driver Version: 410.78 CUDA Version: 10.0 |
|-------------------------------±---------------------±---------------------+
| GPU Name Persistence-M| Bus-Id Disp.A | Volatile Uncorr. ECC |
| Fan Temp Perf Pwr:Usage/Cap| Memory-Usage | GPU-Util Compute M. |
|===============================+======================+======================|
| 0 GeForce GTX 108… Off | 00000000:05:00.0 On | N/A |
| 20% 47C P8 11W / 250W | 93MiB / 11175MiB | 0% Default |
±------------------------------±---------------------±---------------------+
| 1 GeForce GTX 108… Off | 00000000:06:00.0 Off | N/A |
| 20% 48C P8 9W / 250W | 2MiB / 11178MiB | 0% Default |
±------------------------------±---------------------±---------------------+
| 2 GeForce GTX 108… Off | 00000000:09:00.0 Off | N/A |
| 20% 50C P8 11W / 250W | 2MiB / 11178MiB | 0% Default |
±------------------------------±---------------------±---------------------+
| 3 GeForce GTX 108… Off | 00000000:0A:00.0 Off | N/A |
| 20% 33C P8 9W / 250W | 2MiB / 11178MiB | 0% Default |
±------------------------------±---------------------±---------------------+